MCAssembler: Move Symvers to ELFObjectWriter

Summary: Similar to c473e75

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Differential Revision: https://phabricator.intern.facebook.com/D60251465

Author: MaskRay

llvm/include/llvm/MC/MCAssembler.h

@@ -140,15 +140,6 @@ class MCAssembler {
   handleFixup(MCFragment &F, const MCFixup &Fixup, const MCSubtargetInfo *STI);
 
 public:
-  struct Symver {
-    SMLoc Loc;
-    const MCSymbol *Sym;
-    StringRef Name;
-    // True if .symver *, *@@@* or .symver *, *, remove.
-    bool KeepOriginalSym;
-  };
-  std::vector<Symver> Symvers;
-
   /// Construct a new assembler instance.
   //
   // FIXME: How are we going to parameterize this? Two obvious options are stay

llvm/include/llvm/MC/MCELFObjectWriter.h

@@ -10,6 +10,7 @@
 #define LLVM_MC_MCELFOBJECTWRITER_H
 
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallVector.h"
 #include "llvm/BinaryFormat/ELF.h"
 #include "llvm/MC/MCObjectWriter.h"
 #include "llvm/MC/MCSectionELF.h"
@@ -163,6 +164,15 @@ class ELFObjectWriter : public MCObjectWriter {
   bool SeenGnuAbi = false;
   std::optional<uint8_t> OverrideABIVersion;
 
+  struct Symver {
+    SMLoc Loc;
+    const MCSymbol *Sym;
+    StringRef Name;
+    // True if .symver *, *@@@* or .symver *, *, remove.
+    bool KeepOriginalSym;
+  };
+  SmallVector<Symver, 0> Symvers;
+
   ELFObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW)
       : TargetObjectWriter(std::move(MOTW)) {}
 

llvm/lib/MC/ELFObjectWriter.cpp

@@ -1162,6 +1162,7 @@ void ELFObjectWriter::reset() {
   OverrideABIVersion.reset();
   Relocations.clear();
   Renames.clear();
+  Symvers.clear();
   MCObjectWriter::reset();
 }
 
@@ -1172,7 +1173,7 @@ bool ELFObjectWriter::hasRelocationAddend() const {
 void ELFObjectWriter::executePostLayoutBinding(MCAssembler &Asm) {
   // The presence of symbol versions causes undefined symbols and
   // versions declared with @@@ to be renamed.
-  for (const MCAssembler::Symver &S : Asm.Symvers) {
+  for (const Symver &S : Symvers) {
     StringRef AliasName = S.Name;
     const auto &Symbol = cast<MCSymbolELF>(*S.Sym);
     size_t Pos = AliasName.find('@');

llvm/lib/MC/MCELFStreamer.cpp

@@ -314,7 +314,7 @@ void MCELFStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
 void MCELFStreamer::emitELFSymverDirective(const MCSymbol *OriginalSym,
                                            StringRef Name,
                                            bool KeepOriginalSym) {
-  getAssembler().Symvers.push_back(MCAssembler::Symver{
+  getWriter().Symvers.push_back(ELFObjectWriter::Symver{
       getStartTokLoc(), OriginalSym, Name, KeepOriginalSym});
 }